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Grimsby Dock Tower
Grimsby Dock Tower is a hydraulic accumulator tower and a maritime landmark at the entrance to the Royal Dock, Grimsby, in North East Lincolnshire, England. It was completed on 27 March 1852 with the purpose of containing a reservoir at a height of , that was used to provide hydraulic power to power the machinery of the Grimsby Docks. The extreme height of the tower was necessary to achieve sufficient pressure.
==History and design==
The tower was built to provide water pressure to power the hydraulic machinery (for cranes, lock gates and sluices) at the Grimsby Docks. The tower was built to carry a tank above the ground with a direct feed into the machinery. Small pumps topped up the tank as the hydraulic machinery drew off water. The tower system was brought into use in 1852 working the machinery of the lock gates, dry-docks and fifteen quayside cranes, and also to supply fresh water to ships and the dwelling houses on the dock premises. The water was obtained from a well, fifteen feet in diameter and forty-seven feet deep, with a boring of five inches in diameter to the chalk rock in the centre, situated near to where the ''Grimsby Evening Telegraph'' has its present offices. The well was also fed by seven borings of five inches in diameter, at intervals in a length of three hundred feet, which discharged into the well by a brick culvert three feet in diameter.
Water was conveyed from the well to the tower in a cast iron pipe thirteen inches in diameter when it was then forced into the tank by two force pumps, each of ten inches in diameter, worked by a duplicate, horizontal engine of twenty-five horse power. All the engines, pumps and pipes and the whole of the machinery were made by Mr Mitchell of the Perran Foundry, Cornwall.
During the building of the tower, Armstrong developed another system using weighted accumulators, which at once was found to have great advantages. The working hydraulic pressure was greater, permitting more compact and cheaper machinery and everything was at ground level. The first such installation was at New Holland dock and pier, actually brought into use more than a year before the Grimsby system.
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